Method for crystallizing anhydrous fructose from its aqueous solutions
CA 2034475 C · Owner: Heikkila, Heikki · Inventors: Heikkila, Heikki; Nurmi, Juha
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Crystallizing anhydrous fructose by preparing an aqueous solution containing at least about 90% dry substance the fructose content of the dry substance being at least about 90% by weight; seeding the aqueous solution at a temperature of 50-60°C; and cooling the resulting mass at a controlled rate and with continuous mixing such that the supersaturation of the liquid solution with respect to saturated fructose is less than a ratio of about 1.25 and the temperature difference between the warmest and coolest portions of said solution is no more than about 6°C. Cooling is accomplished in a crystallizer with a heat transfer surface of 5 mm2/mm3 or greater. This method enables large scale, high …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 17, 1991 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.